Flutterでビルドした時にminSdkVersionでエラーが出たのでメモ
android\app\build.gradle
defaultConfig {
// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
applicationId "com.example.hello_world"
// minSdkVersion 16
minSdkVersion 17
targetSdkVersion 30
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName
}